KVM: x86: remove the dead code of KVM_EXIT_HYPERCALL

KVM_EXIT_HYPERCALL is not used anymore, so remove the code

Signed-off-by: Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 4e533d2..4650531 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -5389,10 +5389,6 @@
 	if (r <= 0)
 		goto out;
 
-	if (kvm_run->exit_reason == KVM_EXIT_HYPERCALL)
-		kvm_register_write(vcpu, VCPU_REGS_RAX,
-				     kvm_run->hypercall.ret);
-
 	r = __vcpu_run(vcpu);
 
 out: